Inevitably, you wind up in some hotel without the charger or adapter you need. You forgot to pack it. You left it somewhere. You aren’t alone. You aren’t the first person to leave a charger behind. Lots of people have left theirs behind — in the exact same hotel where you find yourself!
So head down to the front desk and ask. They’ll offer you a lost-and-found box of chargers, micro-USB cables and some may even have laptop adapters. Borrow the one you need. They may even let you keep it if there are plenty.
Another thing to do is head to your closes drug store or Target / Walmart, etc. They have many generic versions of chargers that you can purchase for cheap. It is a good practice to always have a spare that you keep in your travel bag.